In this task, you are given an article. Your task is to summarize the article in a sentence.

Detectives recovered new evidence from the strap of a bag found close to the bus stop where the 18-year-old A-level student was stabbed to death.
Improvements in forensic testing led to the breakthrough, the Met said.
Stephen Lawrence was murdered by a group of six white youths in an unprovoked attack in Eltham in 1993.
Gary Dobson and David Norris were found guilty of his murder and sentenced to minimum terms of 15 years and two months and 14 years and three months in January 2012.
The investigation into Mr Lawrence's death remains open, with around 13 officers still working on the case led by Det Ch Insp Chris Le Pere.
The black leather strap, which did not belong to Mr Lawrence, is believed to have been left in Dickson Road, by the junction with Well Hall Road close to the scene of the murder on 22 April.
The BBC understands there is no suggestion that a woman was at the scene of the attack but officers are seeking to establish who the bag belonged to, and why it was at the spot where Stephen was attacked.
A reconstruction and appeal for information will be shown on BBC's Crimewatch at 21:00 BST on Monday, on the eve of what would have been Stephen Lawrence's 42nd birthday.
His father, Neville Lawrence, will also appeal for further information about the murder.
Officers have spoken to around 110 people in connection with this line of inquiry, and gathered 50 DNA samples.
Police are still trying to trace a man reportedly seen in a distinctive green jacket with a V emblem near Well Hall Road Roundabout at about the time Mr Lawrence was attacked.
CCTV footage, recently digitally enhanced using techniques not available in 1993, showed him in a nearby off-licence hours before the murder took place.
In a sketch by a police artist, based on their accounts, the wearer of the jacket has light reddish hair.  However the man in the CCTV pictures is dark-haired.
Police say he could be a witness.
The DNA of an unknown woman has been found near to where Stephen Lawrence was murdered in south east London 23 years ago, Scotland Yard has said.

Taffy Mark Evans, 56, formerly of Old Shoreham Road, Lancing, carried out the attacks in Surrey, Sussex and south Wales during the 1980s and 1990s.
Following a trial at Lewes Crown Court, he was found guilty of 19 historic sex offences, and seven counts of making indecent photographs of children.
Evans was a scout leader in Reigate, Surrey, during the 1990s.
He also worked as a train guard on the Redhill to Littlehampton route.
The offences were committed in Charlwood and Redhill in Surrey, Brighton, Burgess Hill and Crawley in Sussex, and Swansea, in south Wales.
After the hearing, Sussex Police said Evans, now of The Crescent, Hurstbourne Tarrant, Hampshire, had systematically groomed and sexually assaulted the boys.
Det Con Heidi McCall said: "He first gained their confidence as a helpful family friend who took them out on trips, including train journeys, swimming and fishing, bought them presents and treats, but then gradually began to abuse each of them."
She said the case showed all reports would be taken seriously no matter how long ago the events occurred.
A former scout leader has been jailed for 26 years for historical sex offences against boys under 14.

The first public "flight" on the 531ft (161m) British Airways i360 tower on Brighton seafront is at 14:00 BST, with fireworks planned for 22:00 BST.
Fireworks were to have been set off on a boat off Brighton beach but it has been unable to get to the location.
Organisers blamed high seas caused by a storm off the Sussex coast.
Visitors to the i360 ascend 450ft (137m) in a 360-degree curved-glass pod on the site once occupied by the entrance to Brighton's ruined West Pier.
The attraction itself, which is fully booked on the opening day, will operate as planned.
The fireworks will be rearranged for another date, with tickets remaining valid.
The tower, which offers views of up to 26 miles of Sussex coastline, has divided local opinion.
Valerie Paynter, of the saveHove campaign, said it was "like something springing horribly out of the earth in a horror movie".
But Glynn Jones, chairman of the West Pier Trust, thought the "vertical pier in the sky" showed "the city is, once again, embracing and celebrating world-class, stunning architecture".
Those going on board can see from Bexhill in East Sussex to Chichester in West Sussex with the South Downs to the north.

A fireworks display for the opening of the world's thinnest tall building has been called off because of bad weather in the English Channel.

